KR20160034559A - Elastic filler for Artificial Grass Comprising Expandable Antimicrobial agent for Environmental Antimicrobial and Anti-mold Property and manufacturing methods thereof - Google Patents

Abstract

The present invention relates to an antibiotic and anti-mold elastic filler and a manufacturing method thereof and, more specifically, relates to a new elastic filler formed by applying antibiotic and anti-mold characteristics to an elastic chip and a manufacturing method thereof. According to the present invention, the elastic chip is the antibiotic and the anti-mold elastic chip wherein a polyurethane coating layer having an expandable antimicrobial agent formed of an expandable graphite, a biopolymer, and an antimicrobial substance is formed on a surface of a recycled or a virgin rubber chip. According to the present invention, the elastic chip enables long term usage as the flexible and strong coating layer is not peeled off during a contraction and expansion process due to an impact and the contraction and expansion process due to a temperature variation, and efficiently prevents bacteria and mold reproduced by moisture absorbed by the rubber chip.

Description

FIELD OF THE INVENTION [0001] The present invention relates to an eco-friendly antimicrobial agent and an anti-fungal synthetic elastomeric filler containing an expandable antimicrobial agent,

The present invention relates to an antibacterial and fungicidal elastic filler and a method for producing the same. More particularly, the present invention relates to a novel synthetic filler for artificial turf and to a method for producing the same.

There is a continuing demand for rubber chips with antimicrobial and fungicidal properties in order to solve the problem of mold odor caused by the characteristic odor of rubber chips and summer moisture.

Prior Art Korean Patent Application No. 10-2013-0055694 discloses a method of coating an inorganic antibacterial agent composed of loess and CaO with a silane compound as a compatibilizing agent and a pigment to coat the surface of rubber material. However, inorganic antimicrobial agents such as CaO and loess are advantageous in that they can prevent cost-benefit and secondary contamination due to use, but there is a fundamental problem that the elasticity of the elastic chips is accompanied by the degradation of the elasticity despite the use of the compatibilizing agent .

Accordingly, there is a continuing need for a new elastic chip capable of maintaining stable physical properties while having antibacterial and fungus resistance by using an inorganic antibacterial agent, and an elastic packaging using the same.

A problem to be solved by the present invention is to provide an environmentally friendly new antimicrobial and fungicidal method for producing an elastic filler for artificial turf.

Another object of the present invention is to provide a new environmentally friendly antibacterial and environmental resilient filler.

In order to solve the above-mentioned problems, the present invention provides an antimicrobial and antimicrobial agent characterized in that an expandable antimicrobial agent composed of expanded graphite, a biopolymer and an antibacterial substance, a pigment and a polyurethane binder are mixed and coated on the surface of a reclaimed or new rubber chip. The present invention provides a method for manufacturing an inner mold-elastic chip.

In one aspect of the present invention, there is provided an antimicrobial and mold resistant elastic chip, wherein a polyurethane coating layer is formed on the surface of a reclaimed or novel rubber chip, the polyurethane coating layer comprising expanded graphite, an expandable antimicrobial agent composed of a biopolymer and an antibacterial substance.

In the present invention, the rubber chip may be a reclaimed rubber chip obtained by pulverizing a waste rubber, a petroleum resin or the like, or a new material elastic rubber chip such as polyurethane or EPDM. Since the physical properties of the waste tires are constant, they can be used in a uniform size regardless of the type. In the case of waste polyurethane, shredded polyurethane chips can be used in shoes, refrigerators, sheets and the like It is preferable that the various urethane used are selected by crushing and scrapped. In the case of new rubber chips, EPDM, polyurethane, etc. can be used and they can be purchased commercially.

In the practice of the present invention, it is preferable that the rubber chip is used without any additional surface treatment so as not to affect the elasticity of the rubber, such as the reclaimed rubber or the rubber. In the present invention, it is preferable that the rubber chip size is a synthetic grass filler having a diameter of about 1-10 mm, preferably about 2-5 mm, in consideration of strength, elasticity and tensile properties.

In the present invention, the expanded graphite is understood to mean expandable nanoparticles or micro-sized graphite particles, and it is possible to modify the surface if necessary.

In the present invention, the biopolymer is a hydrophilic or polar biopolymer derived from a natural material that is easily bound to a substance having an antibacterial function. Although not intending to be limited in theory, the biopolymer plays a role of a carrier or a receptor that efficiently fixes an added antimicrobial substance to expandable graphite stably without loss of intrinsic activity, and then efficiently discharges it to a chip. Preferable examples of the environmentally friendly natural biodegradable polymer material include alginate, pectin, carrageenan, starch, starch hydrolyzate, chitosan, cellulose derivatives (such as methylcellulose, ethylcellulose, hydroxypropylcellulose, hydroxypropylmethylcellulose , Carboxymethylcellulose and the like) and proteinaceous materials such as gelatin, gluten, corn protein, soybean protein and whey protein, and mixtures thereof.

In the present invention, the antimicrobial substance may be an antimicrobial enzyme such as bacteriocin or lysozyme such as nisin or pediocin, an antimicrobial peptide, a natural extract such as garlic, clove, cinnamon, oregano, propolis, , Ethylenediaminetetraacetic acid (EDTA), or synthetic agents such as parabens, triclosan, imaryl, arylisothiocyanate (AITC), etc. These antibacterial substances can be used alone or as an auxiliary raw material Do.

In the present invention, the swellable antimicrobial agent may be composed of 39 to 70% by weight of expanded graphite, 29 to 60% by weight of a raw polymer, and 1 to 10% by weight of an antimicrobial agent. To 10 parts by weight.

In the present invention, the pigment may be an organic or inorganic pigment capable of developing green color so as to form a color coated chip such as green. The pigment may be used in an amount of preferably 0.1 to 1 part by weight, more preferably 0.2 to 0.5 part by weight based on 100 parts by weight of the rubber chip.

In the present invention, a polyurethane binder is mixed with an expandable antimicrobial agent to form a coating layer on the surface of the rubber chip. The binder is preferably used in an amount of 3 to 20 parts by weight, more preferably 4 to 18 parts by weight, and most preferably 5 to 15 parts by weight based on 100 parts by weight of the rubber chip. When the content of the binder is less than 3 parts by weight, the dispersibility of the antimicrobial agent in the binder may be deteriorated, and the coating may peel off from the surface even after coating. When the content of the binder is more than 20 parts by weight, the rubber chips are adhered to each other during coating, resulting in a problem that the chips are agglomerated during the manufacturing process.

In the present invention, the coating layer containing the antibacterial agent is preferably formed to a thickness of 50-500 micrometers, preferably 100-300 micrometers, so that the expandable antibacterial agent can expand properly. When the thickness of the coating layer is too thin, it is difficult to exhibit antimicrobial and fungicidal properties, and the hue of the rubber particles is transmitted, making it difficult to express the color of the elastic chip.

The elastic chip according to the present invention can be used for a long time because the flexible and rigid coating layer is not peeled off during shrinkage and expansion process due to impact and expansion and contraction according to temperature change, Thereby providing an elastic chip.

In addition, when the elastic filler according to the present invention is used in artificial turf grass, it can be used as a means for efficiently preventing bacteria and fungi which can be propagated by moisture absorbed in rubber chips.

Hereinafter, the present invention will be described in detail with reference to examples. The following examples are intended to illustrate the invention and are not to be construed as limiting the scope of the invention in any way. Various modifications and substitutions that can be ordinarily practiced by those skilled in the art are possible in the above-described embodiments.

Example 1

Manufacture of expansive antimicrobial agent

100 g of high purity chitosan powder having a deacetylation degree of 98% or more and a molecular weight of 170 kDa as a biopolymer and 10 g of an antimicrobial peptide-derived antimicrobial peptide as an antibacterial substance were completely dissolved in 10 L of a 2% aqueous acetic acid solution, g, and the mixture was stirred. Then, the solvent was evaporated to prepare an expandable antimicrobial agent.

Manufacture of elastic chips

1 kg of a urethane chip having a particle diameter of about 2-3 mm was charged into a cylindrical reactor, and the temperature of the reactor was raised to 60 캜 while stirring. The coating solution in which 10 g of the expandable antimicrobial agent prepared in the reactor, 100 g of the polyurethane binder, and 1 g of the green pigment were mixed was slowly added dropwise over 2 hours, heated to 80 캜 and stirred for 5 hours. Thereafter, the temperature was gradually lowered, and the temperature was maintained for 8 hours with stirring to prepare an antibacterial and antimicrobial elastic chip having a green appearance.

Example 2

Was prepared in the same manner as in Example 1, except that the content of the expandable antimicrobial agent was changed to 15 g.

Example 3

The same procedures as in Example 1 were carried out except that a high-purity whey protein was used as a raw polymer.

Comparative Example 1

The same procedure as in Example 1 was carried out except that no swelling antibacterial agent was used.

Property measurement

100 parts by weight of the green elastic chips prepared in Examples 1 to 3 and Comparative Example 1 and 30 parts by weight of this liquid type polyurethane binder were mixed and placed in a thickness of 5 cm and pressed at a temperature of about 100 ° C to prepare a sample And the results are shown in Table 1.

Item Practice 1 Practice 2 Practice 3 Comparison 1 Tensile Strength (Mpa) 0.85 0.83 0.82 0.85 Elongation (%) 79 78 77 79 Tensile Stress (MPa) 0.64 0.63 0.66 0.65 Hardness (HS) 57 55 58 57 Exfoliation none none none Some occurrences color green green green green

Color: Visually observe the appearance of the chip surface.

The peeling property was measured by visually checking the state of the chip surface during the 50% compression-restoration cycle of the chip.

Time / Time 0 One 2 3 4 5 Example 1 1.0 x E + 7 1.0 x E + 6 1.0 x E + 6 1.0 x E + 5 1.0 x E + 4 1.0 x E + 4 Example 2 1.0 x E + 7 1.0 x E + 6 1.0 x E + 5 1.0 x E + 5 1.0 x E + 4 1.0 x E + 4 Example 3 1.0 x E + 7 1.0 x E + 5 1.0 x E + 4 1.0 x E + 4 1.0 x E + 3 1.0 x E + 3 Comparative Example 1.0 x E + 7 1.0 x E + 7 1.0 x E + 8 1.0 x E + 8 1.0 x E + 8 1.0 x E + 9

When Lactobacillus plantarum was used as a test microbial strain and the antimicrobial activity was measured while incubating in a medium filled with elastic chips, the number of viable cells was measured in comparison with the control at 5 hours after the incubation, and the antimicrobial activity was measured.

As a result of measurement, it was confirmed that the number of viable cells in the elastic chips containing the expandable antibacterial property was decreased, while the number of viable bacteria was gradually increased in the elastic chips containing no expandable antibacterial agent.

As a result, a novel synthetic filler for artificial turf having antimicrobial and fungicidal properties with good physical properties and peel resistance was obtained.

Claims (4)

Characterized in that a polyurethane coating layer comprising expanded graphite and an expandable antimicrobial agent consisting of a biopolymer and an antimicrobial material is formed on the surface of the reclaimed or novel rubber chip. The antibacterial and fungal elastic filler for artificial grass according to claim 1, wherein the antimicrobial swelling agent is contained in an amount of 1 to 10 parts by weight based on 100 parts by weight of the rubber chip. The antimicrobial and antimicrobial agent for artificial turf according to claim 1 or 2, wherein the swellable antimicrobial agent is composed of 39 to 70% by weight of expanded graphite, 29 to 60% by weight of a raw polymer, and 1 to 10% Fungal elastic filler. The antimicrobial and fungal elastic filler for artificial grass according to any one of claims 1 to 3, wherein the coating layer further comprises a pigment.